| 摘要 |
<p>The invention concerns a sealing material (1) designed to be heat-sealed on one edge B (20) of a container (2) comprising: a substrate S (3), an adhesive pressure-sensitive layer P, a heat-sealing layer T (5). In said material: a) the adhesive force FATB between the heat-sealing layer T and the edge B of said container is greater than the cohesive force FCT of the heat-sealing layer T; b) the adhesive force FASP between the material layer of structure S and the adhesive layer P is greater than the cohesive force FCP; c) the cohesive force FCP of the adhesive layer P is greater than the cohesive force FCT of the heat-sealing layer T; and d) the cohesive force FCT of the heat-sealing layer T, evaluated by the formula MY.E/R, ranges between FCP and 0.75.FCP, MY being the elasticity modulus of the layer T, E its thickness and R the percentage of shrinkage deemed to be not less than 40 %; thereby providing an easy-to-open and reclosable heat-sealing material.</p> |
